Cheat sheet:
Open source: do anything you want with the source, including closing it off. (https://opensource.org/osd)
Free software: you can’t close it off either; you must share alike. (https://www.fsf.org/about/what-is-free-software)
Ethical technology: all of the above, and don’t make technology that violates human rights. (https://ind.ie/ethical-design)
Open Source is open as in “open for business”, free software guarantees a healthy commons, and ethical technology builds on free software but excludes unethical uses.